From e63325a777edc296ed63c10ce22e0ca9005c1a71 Mon Sep 17 00:00:00 2001 From: das Date: Sun, 5 Dec 2010 22:18:35 +0000 Subject: Add regression tests for logarithmic functions in the math library. --- tools/regression/lib/msun/Makefile | 2 +- tools/regression/lib/msun/test-logarithm.c | 158 +++++++++++++++++++++++++++++ tools/regression/lib/msun/test-logarithm.t | 10 ++ 3 files changed, 169 insertions(+), 1 deletion(-) create mode 100644 tools/regression/lib/msun/test-logarithm.c create mode 100644 tools/regression/lib/msun/test-logarithm.t diff --git a/tools/regression/lib/msun/Makefile b/tools/regression/lib/msun/Makefile index d5f1594..eb9a6ae 100644 --- a/tools/regression/lib/msun/Makefile +++ b/tools/regression/lib/msun/Makefile @@ -1,7 +1,7 @@ # $FreeBSD$ TESTS= test-conj test-csqrt test-exponential test-fenv test-fma \ - test-fmaxmin test-ilogb test-invtrig test-lrint \ + test-fmaxmin test-ilogb test-invtrig test-logarithm test-lrint \ test-lround test-nan test-nearbyint test-next test-rem test-trig CFLAGS+= -O0 -lm diff --git a/tools/regression/lib/msun/test-logarithm.c b/tools/regression/lib/msun/test-logarithm.c new file mode 100644 index 0000000..e1c0f25 --- /dev/null +++ b/tools/regression/lib/msun/test-logarithm.c @@ -0,0 +1,158 @@ +/*- + * Copyright (c) 2008-2010 David Schultz + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Tests for corner cases in log*(). + */ + +#include +__FBSDID("$FreeBSD$"); + +#include +#include +#include +#include +#include + +#ifdef __i386__ +#include +#endif + +#define ALL_STD_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \ + FE_OVERFLOW | FE_UNDERFLOW) + +#pragma STDC FENV_ACCESS ON + +/* + * Test that a function returns the correct value and sets the + * exception flags correctly. The exceptmask specifies which + * exceptions we should check. We need to be lenient for several + * reasoons, but mainly because on some architectures it's impossible + * to raise FE_OVERFLOW without raising FE_INEXACT. + * + * These are macros instead of functions so that assert provides more + * meaningful error messages. + * + * XXX The volatile here is to avoid gcc's bogus constant folding and work + * around the lack of support for the FENV_ACCESS pragma. + */ +#define test(func, x, result, exceptmask, excepts) do { \ + volatile long double _d = x; \ + assert(feclearexcept(FE_ALL_EXCEPT) == 0); \ + assert(fpequal((func)(_d), (result))); \ + assert(((func), fetestexcept(exceptmask) == (excepts))); \ +} while (0) + +/* Test all the functions that compute log(x). */ +#define testall0(x, result, exceptmask, excepts) do { \ + test(log, x, result, exceptmask, excepts); \ + test(logf, x, result, exceptmask, excepts); \ + test(log2, x, result, exceptmask, excepts); \ + test(log2f, x, result, exceptmask, excepts); \ + test(log10, x, result, exceptmask, excepts); \ + test(log10f, x, result, exceptmask, excepts); \ +} while (0) + +/* Test all the functions that compute log(1+x). */ +#define testall1(x, result, exceptmask, excepts) do { \ + test(log1p, x, result, exceptmask, excepts); \ + test(log1pf, x, result, exceptmask, excepts); \ +} while (0) + +/* + * Determine whether x and y are equal, with two special rules: + * +0.0 != -0.0 + * NaN == NaN + */ +int +fpequal(long double x, long double y) +{ + return ((x == y && signbit(x) == signbit(y)) || isnan(x) && isnan(y)); +} + +void +run_generic_tests(void) +{ + + /* exp(1) == 0, no exceptions raised */ + testall0(1.0, 0.0, ALL_STD_EXCEPT, 0); + testall1(0.0, 0.0, ALL_STD_EXCEPT, 0); + testall1(-0.0, -0.0, ALL_STD_EXCEPT, 0); + + /* log(NaN) == NaN, no exceptions raised */ + testall0(NAN, NAN, ALL_STD_EXCEPT, 0); + testall1(NAN, NAN, ALL_STD_EXCEPT, 0); + + /* log(Inf) == Inf, no exceptions raised */ + testall0(INFINITY, INFINITY, ALL_STD_EXCEPT, 0); + testall1(INFINITY, INFINITY, ALL_STD_EXCEPT, 0); + + /* log(x) == NaN for x < 0, invalid exception raised */ + testall0(-INFINITY, NAN, ALL_STD_EXCEPT, FE_INVALID); + testall1(-INFINITY, NAN, ALL_STD_EXCEPT, FE_INVALID); + testall0(-1.0, NAN, ALL_STD_EXCEPT, FE_INVALID); + testall1(-1.5, NAN, ALL_STD_EXCEPT, FE_INVALID); + + /* log(0) == -Inf, divide-by-zero exception */ + testall0(0.0, -INFINITY, ALL_STD_EXCEPT & ~FE_INEXACT, FE_DIVBYZERO); + testall0(-0.0, -INFINITY, ALL_STD_EXCEPT & ~FE_INEXACT, FE_DIVBYZERO); + testall1(-1.0, -INFINITY, ALL_STD_EXCEPT & ~FE_INEXACT, FE_DIVBYZERO); +} + +void +run_log2_tests(void) +{ + int i; + + /* + * We should insist that log2() return exactly the correct + * result and not raise an inexact exception for powers of 2. + */ + feclearexcept(FE_ALL_EXCEPT); + for (i = FLT_MIN_EXP - FLT_MANT_DIG; i < FLT_MAX_EXP; i++) { + assert(log2f(ldexpf(1.0, i)) == i); + assert(fetestexcept(ALL_STD_EXCEPT) == 0); + } + for (i = DBL_MIN_EXP - DBL_MANT_DIG; i < DBL_MAX_EXP; i++) { + assert(log2(ldexp(1.0, i)) == i); + assert(fetestexcept(ALL_STD_EXCEPT) == 0); + } +} + +int +main(int argc, char *argv[]) +{ + + printf("1..2\n"); + + run_generic_tests(); + printf("ok 1 - logarithm\n"); + + run_log2_tests(); + printf("ok 2 - logarithm\n"); + + return (0); +} diff --git a/tools/regression/lib/msun/test-logarithm.t b/tools/regression/lib/msun/test-logarithm.t new file mode 100644 index 0000000..8bdfd03 --- /dev/null +++ b/tools/regression/lib/msun/test-logarithm.t @@ -0,0 +1,10 @@ +#!/bin/sh +# $FreeBSD$ + +cd `dirname $0` + +executable=`basename $0 .t` + +make $executable 2>&1 > /dev/null + +exec ./$executable -- cgit v1.1